I think FR has several different configurations they've used on different models and even changed them from year to year. The one that came with my 2014 312BHX was made by Mor-Ryde but they were custom made for FR and not sold separately through Mor-Ryde. You might be able to get one through FR's parts dept.
I never liked mine because you cannot close the outdoor kitchen door while it's unfolded and setup. I ended up removing it and now carry a WeberQ grill and folding stand that can be rolled around and placed anywhere I want in the camp site without interfering with the outdoor kitchen door. I never used the stove so this works better for me.
My old Mor-Ryde grill/stove rack is sitting in my attic collecting dust. If you want to buy a used one, PM me.
2014 Wildcat 312BHX
2015 RAM 2500 Mega Cab 6.7 Cummins Turbo Diesel